Pulp-suction die



May 28, 1929. J.' F. LOW

' PULP SUCTION DIE Filed April 25, 1928 INVE-NTOR BY ic/ /zizmd w 7 4 IWWVI VV/M Patented May 28, 1929.

UNITED STATES PATENT GFFIQE.

JAMES FLEMING LOW, OF TORONTO, ONTARIO, QANADA'.

PULP-SUCTION DIE.

Application filed April 23,

. This invention relates to an improved pulp suction die, as describedin the present speci-- 'cifically in the claims for novelty following adescription containing an explanation in detail of an acceptable form ofthe invention.

The objects of the invention are to construct an eflicient die, simplein construction and of manufacture; to design a die that is not easilyplugged and that may be easily cleaned and readily assembled to the dieholder or vacuum chamber; and generally to provide an economical diecapable of accomplishing the aforesaid purposes.

This die is adapted to be used in such machines as are now known to theart and is particularly adaptable to the vacuum chamber described in aformer filed October 31, 1927, as erial No. 230,021 and is also animprovement over the die described in the said application.

In the drawings, Figure 1 is a plan view of the die assembled.

Figure 2 is a perspective view of one of the segments in the die.

Figure 3 is a fragmentary cross sectional view showing the die assembledin any of the usual die boxes.

Figure 4: is a fragmentary plan view of Figure 2.

Like numerals of reference indicate corresponding parts in the variousfigures.

Referring to the drawings, 10 is the die complete consisting of the twoend clamping pieces 11 held in position by the bolts 12 having thecountersunk heads 13 and nuts 13A countersunk in the openings 14 formedin the clamping pieces 11, and the corrugated segments pr strips 16 heldin place between the clamping pieces 11. The corrugated segments 15 haveregularly spaced holes 16 punched therethrough through which the bolts12 are inserted, thus serving to prevent any "end motion of thesegments, the bolts 12 fitting snugly through the holes 16. The upperedge 17 may be given any shape so as to give the desired shape to thearticle being formed on the die. The segments 15 are corrugated in sucha manner that the ridges or fragmentary corrugations will be normal tothe upper face I of the die, that is vertical to the longitudinal axisof said segments, and are placed side by gatent application 7 1928.Serial No. 272,182.

side so that the points 18 of the corrugations in the segments willcoincide with said points in the neighbouring segment, and thus smallcells or openings 19 will be formed between each of the segments throughwhich the vacuum will act to draw the moisture from the die and leavethe pulp substance deposited on the upper edge 17.

The chief advantage in this form of die is that the most minuteparticles of pulp are deposited on the upper edge'of the corrugations,as the openings or cells 19 are very small and prevent the pieces frombeing drawn into said openings bysuction. Another advantage is that anystrips of pulp will be prevented from entering the openings. assometimes happens in the caseof laminated dies in which strips arespaced one from another by shims or spacers. It will be noted that the.points 18 ofthe corrugations are slightly rounded so as to present aproper bearing space against which the neighbouring segment orcorrugated strip may bear.

In Figure 3, the die 10 is shown as assembled in the die box 22 and therelieved portion in the upper edge 17 of the segments or corrugatedstrips is shown as at 20. It is to be understood that the edge 17 may begiven such a profile as to form any of the desired shapes. In thedrawings the thickness of the corrugated stri s are exaggeratedconsiderably for the sa e of clearness. It is to be noted that thecorrugations are so formed that the openings 19 will be very small, thatis approximately the same as a very fine screen, the strips themsefigging in the neighbourhood of from .010 t I an inch in thickness, or of agreater thickn advisable.

What I claim is:

1. In a pulp suction die a plurality of vertically corrugated sheetsdrawn together in point to point contact and set in a suction box andforming a mould bed at the upper ends and water passages therefrom.

' 2. In a pulp suction die, a plurality of vertically corrugated sheetsclamped together from the moulds and clamping bars and bolts. the pointsof corrugation in said metal strips 5. In a pulp suction die a matrixcomprisbear ng one against the other, a pair of metal ing a plurality ofcorrugated sheets having bars terminating the die on two sides thereof,

angular points meeting angular points and holes through said corrugatedstrips and 15 5 bolt holesin alignment, bounding Walls havthrough saidmetal bars, bolts engaging said ing bolt and nut recesses and boltsextending holes and anchored in said bars and forming through said boltholes and having their means of releasably locking said strips in headsand nuts countersunk in said recesses. their spaced relation betweensaid bars.

6. Ina pulp suction die, a plurality of cor- Signed at the city ofToronto, this 8th day 20 10 rugated metal strips forming on one edge ofFebruary,'1928. v the configuring wall of said die and having JAMESFLEMING LOW.

